How do I search for a mail folder in Mail by name?
The answer is, use the "Help" menu search field, not the search window.
Posting this here in response to closed "Finding Folders in Mail" question elsewhere in which author said: "I have lots of folders and sub-folders in which I file emails. I can easily search for, and find, email messages in Mail's search window. But how do I find folders that are buried in other folders? I know the name of the folder I want, but I don't know where it's buried."
Yes! I had this problem. Alas, the solution wasn't in that other closed question. So I'm posting it here, in case others have the same issue.
It turns out the "Help" field gives you the folder locations and shows you the whole context, folders, subfolders. It's really cool.
The search field just helps you find emails. Each email also has a faded icon of a folder and name where the email resides, but alas, you can't simply click that icon to get to the folder.
But, "Help" does the job.
iMac, OS X 10.11